Swansea Coroner's Office has told ITV News that further tests will now be carried out on Gareth Colfer-Williams, which are expected to take six to eight weeks.
His family have raised questions about the medical care he received in the days before his death.
More top news
A mild and murky night with rain clearing but fog patches gathering by the early hours of the morning.
Police are appealing for information after a man died following an assault outside a hospital.
Joyce Cox's body was found in woodland in Cardiff just after the outbreak of World War Two.